High strength and high conductivity nanoparticle-precipitated copper ally : optimizaiton of thermomechanical processing

高强度和高导电性纳米颗粒沉淀铜合金：热机械加工的优化

• 批准号: 15560601
• 负责人: FUJII Toshiyuki
• 金额: $ 1.86万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560601/
• 关键词: precipitation hardening; crystallographic orientation relationship; invariant line; yield stress; high resolution electron microscopy; particle shape; age hardening; 時効析出; 不変線; 降伏点降下現象; ナノ粒子; 粒子形態; 形状安定性; 分散強化; 高導電性Cu基合金; 加工熱処理; 飽和磁化; 磁気異; precipitation hardening; crystallographic orientation relationship; invariant line; yield stress; high resolution electron microscopy; particle shape; age hardening; 時効析出; 不変線; 降伏点降下現象; ナノ粒子; 粒子形態; 形状安定性; 分散強化; 高導電性Cu基合金; 加工熱処理; 飽和磁化; 磁気異

Crystallography and morphology of precipitate particles in Cu-Fe-Co, Cu-Co-Cr and Cu-Ni-Si alloys were investigated. From experiments using Cu-Fe-Co alloys, it has been found that fcc Fe-Co particles transform into bcc particles by applying magnetic field. Transformability of the particles strongly depends on the particle size, cooling rate and the composition of the particles. It has been found that the magnetic field is useful to control microstructures without any deformation of a specimen.Through extensive investigation using Cu-Ni-Si alloys, it has been found that the crystallographic orientation relationship between Ni_2Si precipitate particles and a Cu matrix, (110)_<Cu>//(001)_<Ni2Si>, [001]_<Cu>//[010] _<Ni2Si>, is satisfied. The Ni_2Si particles tend to grow along the invariant-line direction. The strength is strongly affected by not only the size but also the shape of particles. The elongated shape of the particles results in retarding the peak aging time. We concluded that we are able to obtain the optimum aging condition for the maximum strength with precise consideration of the shape of particles.

研究了Cu-Fe-Co，Cu-Co-CR和Cu-Ni-Si合金中沉淀颗粒的晶体学和形态。从使用Cu-Fe-CO合金的实验中，已经发现FCC Fe-CO颗粒通过施加磁场转化为BCC颗粒。颗粒的转换性在很大程度上取决于粒径，冷却速率和颗粒的组成。已经发现，磁场对于控制微观结构而没有任何样品的任何变形。通过Cu-Ni-Si合金进行广泛的研究，已经发现，Ni_2si沉淀粒子与Cu矩阵（110）_ <cu> //（cu> ///（001）_ <ni2ss _ <ni2si2si> [001] _ <cu> // [010] _ <ni2si>，满足。 Ni_2si颗粒倾向于沿着不变的线方向生长。强度不仅受到大小，而且还受颗粒形状的影响。颗粒的细长形状会导致峰值老化时间。我们得出的结论是，我们能够通过精确考虑颗粒形状来获得最大强度的最佳老化条件。